Google has very strict policies against proxies and they have very strong methods to detect proxies, so in most cases virgin dedicated proxies will be the best to go meanwhile login from same proxy for multiple accounts will trigger an alert so if you have 500 accounts to deal with then 500 proxies will be safe + using the same 500 proxies to access Yahoo will be fine too.

If don't want to get blocked, then in any case you will need to play safe and 1:1 is the only best option for proxies and email accounts. Proxy quality will matter so better purchase with some reputed provifders and contact them before making order regarding your requirement.

I am really curious that how you are operating 500 Google accounts ?? because in my analysis Google has very tough criteria in this regard. However, one proxy will be enough like hola or zenmate but you should have to open them with long intervals of time.

if you can build a bot which accesses the accounts via POP, you won't even need any proxies, at least that's the case with hotmail, i accessed thousands of accs from the same ip via POP and the accs are still fine

Note that adblockers might block our captcha, and other functionality on BHW so if you don't see the captcha or see reduced functionality please disable adblockers to ensure full functionality, note we only allow relevant management verified ads on BHW.